Compressor



Sept. 4, 1928. 1,683,182

c. l.. HElsLER COMPRESSOR Filed Dec, 6, 1927 FI rlx u Inventor: CharlesL. Hesler,

His Attorney.

Patented SeptA 4, 1928.

UNITED STATES' PATENT ma...

examinan COMPRESSOR.

Application led December 6, 191W. Serial No. 238,191.'

My invention relates to 'compressors for refrigerating machines andpartlcularly to refrigerating machines which are'especially adapted fordomestic use. An ob]ect of my invention is to rovide an improvedcompressoiof this character which is simple 1 n construction', eicientin o eration 'and is relatively free from vibration and nolse.

My invention will be better understood from the following descriptiontaken 1n connection with the accompanying drawing, and its scope will bepointed out in the appended claims.

Referring to the drawing, F. 1 1s a sectional view of a machineembodyingmy 1nvention, and Figs. 2 and 3 are detalls thereof drawn tolarger scales.

In the drawing I have shown a fragment of a refrigerating machineembodying my improved compressor mounted on the top 1 of, a refrigeratorcabinet, through which top extend the inlet and outlet pipes 2 and 3 resectively for the evaporator, not shown, wit in the cabinet. Arranged onthe top 1s the bed plate 4 on which rests the fixed frame 5 whichsupports the stator 6 of the driving motor and which has a bearing forthe drive shaft 7. Clamped against 'the base 4 is the enclosing casing 8in which the compressor and driving motor are hermetically sealed.Extending around the casing 8is the condenser coil 10, one end of whichconnects with the interior of the casing and the other end of whichconnects with ipe 2, which connects with the evaporator t rough a floatvalve, not shown.

In accordance with minvention the compr'essor is a symmetrica ,compactand simple construction which in this instance is arranged in theenclosing casing 8. The compressor com rises a fixed stud 12 arrangedcentrally o the bed plate 4 upon which rotates a frame 13 secured to thedrive shaft 7. The frame is symmetrically constructed with respect tothe axis of rotation thereof and on opposite sides of the axis are thetwo cylinder bores 14 symmetrically arranged with respect to the axis ofrotation. The two pistons 15 are secured at their adj acent ends to thescotch yoke 16 in which a slide or cross head 17 is mounted to slidetransversely. The fixed pin 18 is mounted eccentrically in th'e post 12and is journalled in the slide 17. The upper end of the pin 18terminates in an offset portion 19 which 0F SCHENEGTADYVLNEW Yonx,assrenoa ro GENERAL inmoraleconm, a oonronarroir or Naw Yonx.

is concentric with the axis of the post 12 and for the shaft. The rotor20 of the electric motor is secured directly to the drive shaft 7 andits weight together with the weight of the member 13 and the pistons isvsustained by theaforesaid thrust bearing. Each cylin der is shownhaving a flap exhaust valve 22 and over the^valves are the sheet metalca 23 with which connect the passages 24 in tii frame 13 for the escapeof the compressed as or refrigerant. Secured to and enclosing therotatable frame 13 is the sheet metal the shaftJ 7 and which forms athrust bearing casing 25 shown as comprising a lower cylindrical portionand an upper conical portion. In this construction the moving parts aresymmetrically arranged with respect to the axis of rotat1on and arebalanced, hence vibration and noise due to the operation of the machineare reduced to a minimum. A11- other important feature of thisconstruction is the lubricating system and the oil seal for the exhaustvalve and for the inlet passage for refrigerant. A quantity .of oil isplaced in the outer casing 8 which when the apparatus is at restcollects in the bottom as shown in the drawing. dTwo pipes 26 and 27carried by the frame 13 on opposite sides thereof have their lower ends-well below the oil level and turned in the direction of movement sothat oil will be forced up the pipes by the rapid movement thereof. Theupper end of each pipe terminates in a half turn, the exit opening beingat a greater distance from the axis of rotation than the entranceopening and the oil delivered therefrom is caught by the circular fixedreceptacle 28.

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Suitable passages 29 carryl the oil from receptacle 28 to the bearing ofshaft 7 from the lower end of which it passes partly through the innerpassages 30 to the thrust bearing ring 31 and partly through the outerpassages 32 to the space 33 inclosing the yoke, cross head, slide, etc.from which it finally escapes into the casing 25. Because of thecentrifugal force the space 33 is not filled with a solid mass of oilduring the operation of the compressor though the parts are welllubricated. The eccentric pin 18 has a gasinlet assage whichcommunicates with pipe 3 an leads up through the thrust bearing ring 31where it communicates with the lateral passaevsh34 connecting with theinlet ports 35. ile the machine is running, the casing 25 of thecompressor is maintained substantially full of oil, thc surplus escapingfrom the central opening 36 in the to of the casing. The bearings arethereb liept thoroughly supplied with oil and t e. as passage throughthe thrust bearing and he exhaust valve are provided with an oil seal.The com ressed gas ex elled from the exhaust va ve will natura 1y flowtoward the axis of rotation because of the centrifugal force of theheavier oil and will follow up through the passages 24 and out througthe opening 36.

I have chosen the particular embodiment described above as illustrativeof my invention and it will be apparent that various modifications maybemade Without departing from the spirit and scope of my invention whichmodifications I aim tocover by' the appended claims.

What I claim .as new and desire to secure by Letters Patent of theUnited States, isz,

1. A compressor comprisinor a fixed member, a pluralit of cylindersrotatably mounted on saidy member, a piston in each c linder, a fixedeccentric, means connecting t e eccentric with the pistons, said fixedmember and said cylinders being provided With communicating intakepassages controlled by the relative movements of said pistons.

2. A compressor comprising a fixed member, a plurality of radialcylinders rotatably mounted on said member, an exhaust valve on theouter end of each cylinder, a piston in each cylinder, a fixedeccentric, means connecting the eccentric with the pistons, saidcylinders having intake ports arranged intermediate their ends and saidfixed member and cylinders having communicating open intake passagesconnectin with said ports.

3. A compressor comprising a fixed bearing member, a frame having a pairof opposed cylinder bores formed therein rotatably mounted on saidmember, a piston in each cylinder, a scotch yoke connecting saidpistons, a fixed eccentric pin in said yoke, said frame having intakepassages formed therein terminating in intake ports in the cylinderbores and said bearing member having a passage therein communicatingwith said intake passages.

4. A compressor comprising a fixed bearin stud, a frame having a pair ofopposed cy inder bores formed therein rotatably mounted on said stud, apiston in each cylinder, a scotch yoke connecting the pistons, av

slide in said yoke, a fixed eccentric pin secured to said stud andjournalled in said slide, said frame having intake assages formedtherein terminating in intake' ports in the cylinder bores and saidbearing stud and fixed eccentric having an opening communicating withsaid passa es.

`5. A com ressor com rising a rotatable cylinder an iston an a fixedcrank pin, an exhaust va ve at theouter end of the cylinder, and meansoperative during the rotation of the cylinder to maintain the cylinderand the exhaust valve immersed in lubricatin oil.

6. compressor comprising a fixed crank pin, a piston and cylindermounted torotate eccentrically about the pin, an exhaust valve at theouter end of the cylinder, and a rotatable oil retaining casin enclosingthe cylinder and exhaust valve, t e oil in said casing forming a sealfor said valve.

7. A compressor com rising a fixed crank pin, a piston and cylin ermounted to rotate eccentrically, about the pin, an exhaust valve at theouter end of the cylinder, and a rotatable oil retaining casing enclosinthe cylinder and exhaust valve and having a central discharge openingtherein whereby in the operation of the compressor the body of oil inthe casing forms a seal for said valve and is maintained out ofengagement with said pin.

8. A compressor comprising a fixed crank pin, a rotatable structuremounted eccentricall thereof and comprisin a plurality of cy indershaving istons ierein journalled on said pin, exliaust valves coveringthe outer ends of said cylinders and an annular oil retaining casingenclosing the cyiinders and valves and means responsive to the rotativemovement of said structure for supplying'oil to the central portionthereof.

A compressor comprising a casing containing lubricating oil, a rotatablestructure therein includin a cylinder and piston, a fixed eccentrica] ymounted crank pin for said piston, said rotatable structure having meansfor lifting the oil from the lower portion of thecasing comprising aduct having an entrance opening below the level of the oil, a fixedmemberarranged to collect the oil delivered by the ducts and means forconveying oil from said member to the bearing surfaces4 of saidstructure.

In witness whereof, I have hereunto set my hand this 5th day ofDecember, 1927.

CHARLES L. HEISLER.

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